DBX 286s Microphone Pre-Amp Processor

DBX 286s Pre-Amp Microphone Processor

DBX 286S Pre-Amp Microphone Processor

The dbx 286s offers a complete complement of measurement and status LEDs to visually guide you to the right sound.
The floating balanced XLR microphone input accepts balanced or unbalanced inputs for easy connection to professional microphones and home studios. The additional 1/4" TRS Line Input can accept balanced/unbalanced signals to process live electronic instruments or pre-recorded tracks at mixdown. Use the Insert jack to interface the mic preamp and signal processing sections to loop out to external processors (such as the EQ or delay unit) or to mix the mic preamp signal to an external destination.

The cost and hassle of putting multiple processors together for use on one track can be frustrating. The dbx 286s gives you all the mic processing you need in one box, with the shortest, cleanest signal path to make your music sound its best!

DBX 286S Pre-Amp Microphone Processor, back view

Key Features:

  • Complete with counters and status LEDs
  • Phantom power at +48V
  • Precision controls with detonation
  • Studio-quality mic preamplifier/studio quality channel strip processor
  • Classic dbx compression puts a great sound at your fingertips
  • Frequency tunable De-Esser reduces sibilance and high frequency distortion
  • Enhancer increases detail and definition of high and low frequencies
  • Adaptive Expander/Gate program
  • The Insert jack allows you to add an external processor


  • XLR Preamplifier Mic Connector Balanced Floating XLR Preamplifier, Pin 2 Hot
  • Microphone preamplifier input impedance ~4.2kΩ
  • Microphone preamplifier gain 0dB to +60dB
  • Mic Phantom Power +48VDC preamplifier, applied to XLR pins 2 and 3 up to 6.81kΩ resistors
  • CMRRR >40dB, typically 55dB
  • Mic Preamplifier max input level 0.2Vrms, Gain = 30dB
  • Input noise equivalent to microphone preamplifier (EIN) -125dBu, 22Hz-22kHz, source impedance 150Ω
  • Input Connectors (Line) Balanced Floats, TIP Hot
  • Input impedance (line) 10kΩ unbalanced, 20kΩ balanced
  • Max. input (line) >+21dBu, balanced or unbalanced
  • Input gain range (line) from -15dB to +45 dB
  • Insert 1/4" TRS connector: Normal; tip is Enter, ring is Return
  • Insert impedance >5kΩ (ring-return); 100Ω (tip-send)
  • Enter maximum level >+21dBu; >+20dBm (600Ω load-tip)
  • Enter Noise <-84dBu, unweighted (20Hz-20kHz); LINE GAIN control set to 0dB
  • Insert distortion < 0.01% THD, 20Hz-20kHz, +10dBu
  • Output connectors 1/4" balanced/unbalanced TRS connectors
  • Output impedance 100Ω unbalanced, 200Ω balanced
  • Maximum output >+21dBu, >+20dBm (600Ω load)
  • Gain adjustment range from -30dB to +10dB
  • Noise <-80dBu unweighted (20Hz-20kHz); Both gain controls set for 0dB, all processing controls OFF
  • Frequency response from 20Hz to 20kHz, +0.5, -0.5dB
  • THD < 0.08%THD, 20Hz-20kHz, +10dBu, all processing controls OFF
  • Compressor threshold range from -40dBu to +20dBu
  • Compressor Threshold OverEasy® Compressor Feature
  • Compressor Ratio >4:1 For input levels above 20dB above the threshold
  • Maximum compression 30dB
  • Compressor attack time dependent on program; >1s for small level increases, up to 10ms for width increases
  • Program dependent compressor release time; adjustable between about 1dB/sec and 75dB/sec
  • Compressor distortion Typically < 0.05%THD, 20Hz-20kHz, 15dB G/R, +10dBu Output, DENSITY @ 0
  • IMD SMPTE: < 0.05%; 60Hz/7kHz 4:1, 15dB G/R, +10dBu output level, DENSITY @ 0
  • De-esser Feature Broadband gain reduction
  • De-esser Frequency range from 800Hz to 10kHz High Pass, 12dB/octave
  • Deesser release time 12dB/octave depending on program; about 1mS/dB
  • Enhancer HF Detail Feature HF Equalizer for shelving controlled by program, about 15dB maximum HF thrust
  • Enhancer LF Detail Feature Boost bell @80Hz, cut bell @250Hz, the ratio is about 2:1
  • Expander/Gate OFF threshold range at +15dBu
  • Expander/Flow ratio adjustable from 1.5:1 to 10:1
  • Maximum Expander/Displacement depth >50dB
  • Expander/Gate Attack time of the Expander/Gate Attack-Dependent from the program, approx. 2mS (at maximum attenuation)
  • Expander/Gate Time-Dependent release time from program, approximately 10mS/dB
  • Dynamic range of the Expander/Gate Typically 105dB
  • Power consumptioOperating voltage DO: 120VAC 60Hz, 100VAC 50/60Hz; EU: 230VAC 50/60Hz
  • Operating temperature from 0°C to 45°C (32°F to 113°F)
  • Dimensions 1.75" x 5.75" x 19" (4.5 cm x 14.6 cm x 48.5 cm)
  • Unit Weight 4.5 lbs. / 2.04 kg.
  • Shipping Weight 6.54 lbs/2.97 kg

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